nightly

# Nightly One `nightly.yml` dispatch builds both platforms by default from one SHA and UTC stamp. `platform=macos` or `platform=windows` selects one. One rolling public `nightly` prerelease serves macOS DMGs, a signed Sparkle appcast, Windows x64 installers, and matching minisign signatures. Each platform keeps two builds by stamp independently on that release. Production feeds and `releases/latest` stay separate. Contract: `docs/arch/arch.md` §14 and `docs/arch/windows.md`. An explicit request to `run` authorizes that workflow dispatch. Reading or editing this skill and `check` do not authorize dispatch. Nightly is a rolling development channel identified by its commit; official version tags are separate, and no nightly crate-version bump is needed. Commit, push, merge, tagging, direct release mutation, app launch/restart, and installation require the user's explicit instruction. Record only observed results; never invent a successful cut or a PC smoke result. ## Usage `/nightly [run [both|macos|windows] | check [both|macos|windows]]` — no action means `run`; omitted platform means `both`. ## `run [platform]` 1. **Preflight — stop on any failure and report it.** - `git fetch origin`; require branch `main`, a clean tree (`git status --short` empty), and `git rev-parse main origin/main` equal. Capture the full `origin/main` SHA. Do not push local commits without instruction. - Check for **any** queued or running nightly, including other platforms: `gh run list --wo...